From Media Wiki
One thing which will hopefully be of interest is the Developers: CCP4 Test Framework, which is a set of tests coded in Python using the unittest framework to put a few CCP4 programs through their paces. These are run every night as part of the nightly builds on a number of different systems.
 CCP4 Library
Another thing which is fairly useful is documentation for the CCP4 library. Although the subroutines are fairly well documented, there's a place to start putting together how-to in CCP4 Library Examples
Pages related to developments for the CCP4i2.